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Allowance for Credit Losses - Summary of Portfolio of Nonaccrual Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Loans and Leases Receivable Disclosure [Line Items] |  |
Financing receivable, nonaccrual | $ 733 | $ 1,918
Commercial and PPP Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing receivable, nonaccrual |  | 35
Commercial Real Estate Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing receivable, nonaccrual |  | 231
Residential Real Estate Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing receivable, nonaccrual |  | $ 1,652

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